Support for package.json exports

Type of Issue

[ ] Bug Report
[x] Feature Request

Description

I would like to have control over what is public in my package and what isn’t. Package Exports gives us ability to define those. This should prevent library users of importing library internals.

Example of usage is here

{
  "exports": {
    "default": {
      "import": "./fesm2015/ngx-abcd.js",
      "require": "./bundles/ngx-abcd.umd.js"
    },
    "node": {
      "import": "./fesm2015/ngx-abcd.js",
      "require": "./bundles/ngx-abcd.umd.js"
    }
  }
}

[alan-agius4]

@costlydeveloper

• https://github.com/ng-packagr/ng-packagr#knowledge
• https://docs.google.com/document/d/1CZC2rcpxffTDfRDs6p1cfbmKNLA6x5O-NtkJglDaBVs/preview

[github-actions[bot]]

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